S-90185A411 1/4"-20 x 5/8" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with Grade 5 classification and 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through zinc-plated steel construction, extending service life in industrial environments
• Secure anti-rotation installation with integrated square neck design that prevents spinning during tightening
• Optimized thread engagement featuring Class 3A thread fit and UNC coarse threading for faster assembly and vibration resistance
• Enhanced durability with Rockwell C25 hardness rating, maintaining structural integrity under repeated stress
• Versatile compatibility with fully threaded right-hand design accommodating various material thicknesses
• Regulatory compliance assurance meeting ASME B18.5, SAE J429 standards plus RoHS 3 and REACH environmental directives

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel carriage bolt delivers critical engineering solutions for industrial fastening challenges. The square neck design provides positive locking action that prevents rotation during assembly, eliminating the need for secondary locking mechanisms in wood-to-metal and structural applications. The UNC coarse threading ensures rapid installation in various materials while maintaining Class 3A thread fit precision for consistent clamping force. With 120,000 psi tensile strength and Rockwell C25 hardness, these carriage bolts withstand heavy vibrational loads in machinery, construction frameworks, and transportation equipment. The zinc-plated finish offers sacrificial corrosion protection, making these fully threaded fasteners ideal for outdoor installations and harsh industrial environments where reliability is paramount.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 3A thread fit tolerance and UNC 1/4"-20 coarse threading. Complies with ASME B18.5 and SAE J429 Grade 5 specifications for material composition and mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards for restricted substances. The 5/8" length and 0.26" square neck dimensions ensure proper fitment in standard applications.